nugatory
ineffectual
uneffective
fizzle
no use
fruitless
futility
inefficaciously
ineffectively
ineffectualness
not worth a whistle
useless as tits on a boar hog
that and a nickel will buy you a cup of coffee
stultify
futilely
piss up a rope
mug's game
lamely
ineffectiveness
inefficacy
holding pattern
void
nonfailure
good for nothing
vitiate
fail
trick
waste of time
neutralize
fool's errand
underworked
ineffectivity
waterproof
run to waste
pound sand
as much use as a chocolate fireguard
deficiency
wish one joy of it
crush
futile
vain
bootless
break down
sleeveless
invalidly
hamstring
duff
half-assed
flaked
no good